That headline should read as common sense to most, but a study conducted by the Swiss Institute of Technology, IBM and Google found that 600 million surfers had not updated their browsers. That means that almost half the online population could potentially be at risk from issues that have already been addressed by the release of patches. It seems that Internet Explorer users are the least likely to update their browser promptly, while the 'single-click' update feature of Firefox means that users of that browser are most likely to be up to date. The study also warns that even an up to date browser can be at risk if the plug-ins it makes use of can be exploited. So when did you last update your browser and plug-ins? It would be wise to take some time to do it now if you haven't recently.